The 7 stories PR pros need to know on Thursday morning, 2.11.2016

Publicis earnings impress; Sanders and Clinton prepare for another debate; Obama on Ellen; Facebook puts space between itself and Marc Andreessen; Royal Caribbean apologizes after early end to trip; Twitter earnings disappoint -- again.

Royal Caribbean apologizes for rough rideThe cruise line issued a mea culpa to passengers after its Anthem of the Seas returned to New Jersey early after encountering terrifyingly rough seas off the coast of North Carolina. The 6,000 passengers on board faced winds of up to 125 mph. "We have to do better," the company said.

Dorsey promises more change as Twitter user base cratersTwitter’s fourth-quarter and full-year 2015 earnings made investors gasp on Wednesday afternoon, with its user base actually shrinking in the fourth quarter by 2 million. (Investors have been keeping a close eye on user numbers). CEO Jack Dorsey said he’ll simplify the platform.